ADI AD7946BRMZRL7

The AD7946 is a 14-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single 5 V power supply, VDD. It contains a low power, high speed, 14-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, it samples an analog input IN+ between 0V to REF with respect to a ground sense IN-. The reference voltage, REF, is applied externally and can be set up to the supply voltage. Its power scales linearly with throughput. The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single, 3-wire bus, or it provides an optional BUSY indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate supply VIO. The AD7946 is housed in a 10-lead MSOP or a 10-lead LFCSP with operation specified from -40°C to +85°C.

• 14-bit resolution with no missing codes
• Throughput: 500 kSPS
• INL: ±0.4 LSB typical, ±1 LSB maximum (±0.0061% of FSR)
• SINAD: 85 dB at 20 kHz
• THD: −100 dB at 20 kHz
• Pseudo differential analog input range 0 V to REF with REF up to VDD
• No pipeline delay
• Single-supply 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
• Proprietary serial interface SPI-/QSPI-/MICROWIRE-/DSP-compatible
• Daisy-chain multiple ADCs and BUSY indicator
• Power dissipation 3.3 mW at 5 V/100 kSPS, 3.3 μW at 5 V/100 SPS
• Standby current: 1 nA
• 10-lead MSOP (MSOP-8 size) and 3 mm×3 mm LFCSP (SOT-23 size)
• Pin-for-pin compatible with the 16-bit AD7686

• Battery-powered equipment
• Data acquisition
• Instrumentation
• Medical instruments
• Process control